User Manual

Table Of Contents
RF-Orchestra!™ Transmitter Installation and Operation Maintenance
July 2000 6880493G02-C 6-27
At least one of the Tranlin register parameters is incorrect. Run RFO FIPS command: a
172 to check the Tranlin device. The information word at the bottom of the list should be
an even number. Bit 0 is the clip detect bit. Perform a DIP switch 2 reset to properly
default the parameters.
There is not enough dynamic range in the power amplifier:
Check for a defective PA (RFO FIPS command: a 68).
Check for a defective power supply using RFO FIPS command: a 192 SHMI 1 trace.
The average RF power level may be set too high. Realign the RF-O! transmitter power
output.
Message has pops and tones
Pops and tones in the message may stem from adjacent channel interference. Check that the
carrier feedthrough is nulled and that pager selects the correct color code. It is possible to get a
“near/far” problem due to a configuration problem where a close transmitter interferes with
one far away. Transmitters that are off frequency or have lost simulcast synchronization can
also cause this problem.
Message is full of hornet sounds
The hornet sound is VICE decompression of noise.
Good signal to noise ratio will reduce “hornets”. Check that SQC is turned on at the
RF-C! controller and is set to the correct threshold to reject pages with bad SNR.
A quiet environment will reduce “hornets”.
Check microphonics (-30 dbc at > 100 Hz from carrier). Microphonics can be caused by a
bad fan or excessive noise / vibration in the environment. Check by disconnecting power
to the RF-B! transmitter controller and the RF-O! transmitter control board fans.